Tiktaalik /tɪkˈtɑːlᵻk/ is a monospecific genus of extinct sarcopterygian (lobe-finned fish) from the late Devonian period, about 375 Ma (million years) ago, having many features akin to those of tetrapods (four-legged animals). Tiktaalik has a possibility of being a representative of the evolutionary transition from fish to amphibians. It is an example from several lines of ancient sarcopterygian fish developing adaptations to the oxygen-poor shallow-water habitats of its time, environmental conditions which are thought to have led to the evolution of tetrapods.